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前言本组对制作梯度型光纤预制棒的实验研究工作开始干1979年3月,月底提出初步方案,六月完成方案审定,并进行了初步试验,至十一月初完成了第一阶段的工作,基本上达到了预定的指标。在短波长区光纤衰耗一般小于5dB/km(0.83μm),数值孔径为0.17～0.20,带宽一般为200MHz·km(3dB));在长波长区(1～1.7μm)获得了两个低衰耗“窗口”,即1.0～1.35μm及1.45～1.70μm波段,在低衰耗“窗口”内,衰耗在1～2dB/km,个别光纤最低衰耗达到0.8dB/km(1.2μm波长)。
Preface This group on the production of gradient optical fiber preform experiment began dry work in March 1979, the end of the month proposed a preliminary program, in June to complete the program validation, and conducted a preliminary test, to early November completed the first phase of the work, Basically reached the predetermined target. In the short wavelength region fiber attenuation is generally less than 5dB / km (0.83μm), the numerical aperture of 0.17 ~ 0.20, the bandwidth is generally 200MHz · km (3dB)); in the long wavelength region Attenuation “window”, namely 1.0 ~ 1.35μm and 1.45 ~ 1.70μm band, attenuation of 1 ~ 2dB / km in low attenuation window, the minimum attenuation of individual optical fiber reaches 0.8dB / km (1.2μm wavelength ).